Definition of put someone on in US English:

put someone on

phrasal verb

informal
  • Deceive or hoax someone.

    • ‘It's entirely clear from the context and the over-the-top quality of the leaked chapter that he is putting us on.’
    • ‘Oh, come on, you know I was only putting you on.’
    • ‘Of the questions posed above, the only one I can answer definitively is whether Saunders is making this stuff up; she is not putting us on.’
    • ‘Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it’
    • ‘In person he is gentle and friendly, and wouldn't think of putting you on.’